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    <title>为数组添加方法（求和，最大值）</title>
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&lt;script type="text/javascript"&gt;
<span>//求和</span>
Array.prototype.sum = function ()
{
	for (var sum = i = 0; i < this.length; i++)sum += parseInt(this[i]);
	return sum
};
<span>//求最大值</span>
Array.prototype.maxima = function ()
{
	for (var i = 0, maxValue = Number.MIN_VALUE; i < this.length; i++)parseInt(this[i]) > maxValue && (maxValue = this[i]);
	return maxValue
};
<span>//应用</span>
var arr = [1,21,3,4,22,45,6,7,32];
alert(arr.join("+") + "=" + arr.sum());<span> //和：141</span>
alert(arr.join("|") + "中, 最大的数是:" + arr.maxima());<span> //最大数：45</span>
&lt;/script&gt;
</pre>
    <script type="text/javascript">
    //求和
    Array.prototype.sum = function() {
        for (var sum = i = 0; i < this.length; i++) sum += parseInt(this[i]);
        return sum
    };
    //求最大值
    Array.prototype.maxima = function() {
        for (var i = 0, maxValue = Number.MIN_VALUE; i < this.length; i++) parseInt(this[i]) > maxValue && (maxValue = this[i]);
        return maxValue
    };
    //应用
    var arr = [1, 21, 3, 4, 22, 45, 6, 7, 32];
    alert(arr.join("+") + "=" + arr.sum());
    alert(arr.join("|") + "中, 最大的数是:" + arr.maxima());
    </script>
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